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  1. or download this
    use Scalar::Util 'dualvar';

...
printf "Polly wanna %s every %d days \n", $funny, 0+$funny;

__END__
  2. or download this
    use Contextual::Return;

...
printf "Polly wanna %s every %d days \n", $funny, 0+$funny;

__END__